There's a new fork of GadgetBridge on F-Droid with the same logo and name as the original one. Be careful which one you choose
CoMaps
Cooperative community open-source fork of Organic Maps, an offline privacy-respecting not-for-profit OpenStreetMap GPS app for your phone.
What's the difference? Are they published by the same developers?
By any chance does it work with Garmin smart watches?
Gadgetbridge itself works with the majority of Garmin watches, but the navigation feature doesn't. For advanced Garmin models you can upload a GPX track onto the watch itself and then use native Garmin navigation with it.
Nope.
From https://gadgetbridge.org/basics/features/navigation/#supported-devices
Supported devices
Navigation instructions are currently supported by the following devices:
- Bangle.js
- Fossil Hybrid HR (needs unofficial app)
- PineTime
- Huawei (only some watches, unknown which)
https://gadgetbridge.org/ because I didn't know it existed. Seems a fun project.
I've been using it on some old smartwatches and it's pretty cool how it integrates with stuff like OpenTracks and Breezy Weather.